STD Plan Retaining Wall

Design Memorandum

TO: All Design Section Staff

FROM: Bijan Khaleghi

DATE: February 8, 2008

SUBJECT: STD Plan Retaining Wall

The attached STD Plan Retaining walls are for immediate use in WSDOT contracts. These plans replace the Standard Plans D1-a through D1-f of WSDOT publication M21-01 “Standard Plans for Road, Bridge, and Municipal Construction”. This memorandum does not apply to the ongoing awarded contracts.

Background:

Beginning January 2008, WSDOT requires all new bridges, bridge widenings, and walls to be designed in accordance with the requirements of the AASHTO Guide Specifications for LRFD Seismic Bridge Design. WSDOT has recently upgraded the Standard Plan Retaining walls to the new AASHTO LRFD seismic design requirement of 1000 year return period earthquake. These plans need FHWA approval for official publication but this may not be done until August 2008. This memorandum is to implement immediate use of the revised wall plans, consistent with the new seismic design policy requirement, while waiting for FHWA’s approval and official WSDOT publication in the Standard Plans.

If you have any questions regarding this memorandum, please contact Bijan Khaleghi at 705-7181.

cc: Mohammad Sheikhizadeh, Bridge Construction - 47354

F. Posner, Bridge and Structures – 47340

STD Plan Retaining Walls

Click on the links below to view a PDF of the following STD Plan Retaining Walls.

Standard Plan D-10.10-00

Reinforced Concrete Retaining Wall Type 1 and 1SW

Standard Plan D-10.15-00

Reinforced Concrete Retaining Wall Type 2 and 2SW

Standard Plan D-10.20-00

Reinforced Concrete Retaining Wall Type 3 and 3SW

Standard Plan D-10.25-00